Aquarium filter assembly with restricted pumping window

DETAILED DESCRIPTION It is an object of the present invention to provide a filter assembly that would eliminate the aforementioned problem.
It is another object of the present invention to provide a window arrangement at the impeller output of the intake tube of the filter assembly which would reduce the turbulence in the flow water at its top surface and prevent spillover on either the back edge of the filter or over the intake chamber.
In accordance with the present invention, there is provided an aquarium filter assembly which comprises a filter housing including a filter compartment with a filter disposed therein.
The filter divides the filter housing into a contaminated water compartment and a clean water compartment.
The filter housing also includes a water intake chamber connected to the filter compartment.
An intake assembly is supported on the filter housing.
An intake tube of the intake assembly has one leg insertable in the aquarium tank and a second leg which is in flow communication with the first leg and extends into the intake chamber.
A motor unit is provided which drives an impeller unit.
The impeller projects into the intake chamber and is connected to the second leg to form part of the intake assembly.
The impeller pumps water from the aquarium tank through the filter.
The impeller is coupled at the outlet of the second leg through a collar which is provided with opening formed at a front and a rear side thereof for permitting water pumped by the impeller to discharge therefrom into the intake chamber and then into the filter compartment.
The opening at the front side is offset relative to the symmetrically located window at the rear side, whereby turbulence of the water discharged into the intake chamber is avoided.
In an embodiment, the width of the opening at the front side of the extension is smaller than that of the opening at the rear side.
In an embodiment of the invention, the offset is in a clockwise direction as viewed from above.
In an embodiment, two windows formed in the tubular extension are rectangular in configuration